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Definition of Pepper spray
1. Noun. A nonlethal aerosol spray made with the pepper derivative oleoresin capiscum; used to cause temporary blindness and incapacitate an attacker; also used as a bear deterrent. 
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1. Noun. A nonlethal aerosol spray made with the pepper derivative oleoresin capiscum; used to cause temporary blindness and incapacitate an attacker; also used as a bear deterrent.